Inulin Extraction and Characterisation of Fresh and Chip Gembili (Dioscorea Esculenta) Extract by Ultrasound-assisted Extraction



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Inulin Extraction and Characterisation of Fresh and Chip Gembili (Dioscorea Esculenta) Extract by Ultrasound-assisted Extraction

A Hilman1*, E. Harmayani2, M. N. Cahyanto2


1Postgraduate Program of Food Science and Technology, Faculty of Agricultural Technology, Universitas Gadjah Mada, Sleman 55281, Yogyakarta, Indonesia

2Department of Food and Agricultural Products Technology, Faculty of Agricultural Technology, Universitas Gadjah Mada, Sleman 55281, Yogyakarta, Indonesia
Keywords: Inulin, prebiotic, fresh gembili, chip gembili, ultrasound-assisted extraction.
Abstract: Inulin has the prebiotic component to improve health and reduce the risk of digestive tract disorders. Gembili (Dioscorea esculenta) is one of inulin source found in Indonesia. Fresh Gembili has a relatively short shelf-life so it needs to be drying into chips. Inulin extraction was the factor that can affect the characteristics of gembili extract. The aim of this research was to determine the effect of ultrasound-assisted extraction on the inulin extraction stage to the yield and the characteristics of fresh and chip gembili extract. The study was conducted in two stages: (1) inulin extraction from fresh and chip gembili with ultrasound- assisted extraction and compared by non-ultrasound extraction; (2) characterisation of physical and chemical properties. The results showed that inulin extraction by ultrasound-assisted extraction was not

different significantly to the yield (30.78%-32.47%); degree of white (92.18-93.69); pH (6.55) and solubility at 25oC (11.26%-12.75%), 60oC (22.50%-25.97%), 90oC (36.34%-37.71%) compared by non-

ultrasound extraction. Gembili extract from fresh and chip gembili by ultrasound-assisted extraction have inulin content was about 10.00%-21.13%; inulin purity was about 61.57-119.22 mg/kg; and viscosity becomes smaller as the temperature increases. It could be concluded that inulin can be extracted from fresh and chip gembili.


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